Read the passage and choose the correct answer

　　Mrs. Green asked her son to look after his baby sister for half am hour when she was doing housework.

　　The boy took the baby out into the garden and they were playing happily Suddenly the baby began to cry. “Billy, what's the matter with Susan? Why is she crying?” Mrs. Green shouted to her son when she heard the baby crying.

　　“She wants my coins.” answered Billy.

　　“Well, let her play with a few of them if it stops her crying.” said Mrs. Green.

　　“But she wants to keep them!” answered Billy.

　　“No, she doesn't!” Mrs. Green said. “She is only a baby She is too young to understand anything.”

　　“But I know that she wants to keep coins,” answered Billy, “She has already swallowed(吞下)two of them!”

(1)Billy was playing happily with his baby sister ________.

[　　]

(2)Mrs. Green ________.

[　　]

A．wanted Billy to stop Susan crying

B．let Billy stop crying

C．asked Billy to keep the coins

D．let Billy play with a few coins

(3)Billy ________.

[　　]

A．had no time to look after Susan

B．had no more coins for Susan

C．didn't want to keep the coins for himself

D．was not good at taking care of babies

(4)Mrs. Green ________.

[　　]

A．stopped to cry

B．was too buy to keep the coins

C．told Susan not to cry

D．didn't know why Susan was crying